Police: Deaths of five in Toledo, Ohio garage could be murder-suicide

Updated at 10:38 p.m. ET: Five people -- two adults and three children -- were found dead of apparent carbon monoxide poisoning in a garage Monday afternoon in Toledo, Ohio. Police said the deaths could be the result of a murder-suicide.

Emergency responders found the grandmother, uncle, three children, two dogs and a cat in a Honda Civic in the grandmother's garage. A Dodge truck in the garage had pumped exhaust -- carbon monoxide -- into the Civic.

The children's grandfather called police shortly after 3 p.m. asking for a wellness check. Firefighters ultimately had to break into the garage.

Toledo Police Sgt. Joe Heffernan said the grandmother and her daughter were involved in a custody battle over the children. The grandmother had been their primary caregiver over the last four years and the mother was in the process of regaining custody.